How to properly remove kernel modules for RTL88x2BU in Ubuntu MATE 19.04

I have installed Realtek RTL88x2BU drivers from Cilynx's GitHub repo using DKMS installation in Ubuntu MATE 19.04 with kernel 5.3.4 (and later 5.3.7)

Drivers worked fine for a week, then suddenly stopped detecting TP-Link Archer T3U AC1300 Wireless USB Adapter altogether. The same adapter works fine with other PC.

This is how drivers were installed: cd rtl88x2bu VER=$(sed -n 's/\PACKAGE_VERSION="\(.*\)"/\1/p' dkms.conf) sudo rsync -rvhP ./ /usr/src/rtl88x2bu-${VER} sudo dkms add -m rtl88x2bu -v ${VER} sudo dkms build -m rtl88x2bu -v ${VER} sudo dkms install -m rtl88x2bu -v ${VER} sudo modprobe 88x2bu 

So how could I completely remove kernel modules of all the previous versions (1.1, 5.6.1, etc) for RTL88x2BU? Many thanks.

1 Answer

You can do the reverse steps:

1. Unload module

   sudo modprobe -r 8822bu sudo modprobe -r rtl88x2bu 

2. Check for all module builds status

   sudo dkms status 

   output

   8822bu, 1.1: added rtl88x2bu, 5.6.1, 5.2.21-050221-generic, x86_64: installed rtl88x2bu, 5.6.1, 5.3.7-050307-generic, x86_64: installed 

3. Unregister it from DKMS, sudo dkms uninstall .. is optional as we are looking for complete purge.

   sudo dkms remove -m 8822bu/1.1 sudo dkms remove -m rtl88x2bu/5.6.1 -k 5.2.21-050221-generic sudo dkms remove -m rtl88x2bu/5.6.1 -k 5.3.7-050307-generic 

4. Remove source from DKMS

   cd /usr/src/ 

   WARNING: Be careful rm -r is a dangerous command!

   sudo rm -r rtl88x2bu-*